Journal
NATURE PHYSICS
Volume 5, Issue 5, Pages 321-326Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS1247
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Funding
- National Science Foundation [NIRT 0210736]
- NSF-NNIN Program
- ARO/iARPA
- Department of Defense
- Harvard's Center for Nanoscale Systems
- NSF
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For coherent electron spins, hyperfine coupling to nuclei in the host material can either be a dominant source of unwanted spin decoherence(1-3) or, if controlled effectively, a resource enabling storage and retrieval of quantum information(4-7). To investigate the effect of a controllable nuclear environment on the evolution of confined electron spins, we have fabricated and measured gate-defined double quantum dots with integrated charge sensors made from single-walled carbon nanotubes with a variable concentration of C-13 (nuclear spin I = 1/2) among the majority zero-nuclear-spin C-12 atoms. We observe strong isotope effects in spin-blockaded transport, and from the magnetic field dependence estimate the hyperfine coupling in C-13 nanotubes to be of the order of 100 mu eV, two orders of magnitude larger than anticipated(8,9). C-13-enhanced nanotubes are an interesting system for spin-based quantum information processing and memory: the C-13 nuclei differ from those in the substrate, are naturally confined to one dimension, lack quadrupolar coupling and have a readily controllable concentration from less than one to 10(5) per electron.
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